These lock nuts are made of high quality steel for durability. Nylon insert lock nuts feature an undersized nylon washer that creates friction with the mating threads to prevent loosening. Multiple sizes are available to fit various bolt types. They help prevent vibration from loosening a bolted joint and resist loosening under vibration to provide reliable locking performance. These lock nuts serve as a durable replacement for standard nuts in hardware, vehicles, household, and outdoor applications. Features: - Made of high quality steel for durability - Nylon insert creates friction to resist loosening - Multiple size options for versatile use - Resistant to vibration-induced loosening - Suitable for a wide range of applications Specifications: - Standard code: DIN982 - Strength class: 8.8 - Surface finishing: Zinc plating - Quantity: 50 pcs Size Options: M3, M4, M5, M6, M8, M10, M12, M14, M16, M18, M20 Dimensions: - M3: Width 8mm / 0.3in, Height 5.5mm / 0.2in - M4: Width 10mm / 0.4in, Height 6.5mm / 0.3in - M5: Width 13mm / 0.5in, Height 8mm / 0.3in - M6: Width 17mm / 0.7in, Height 10mm / 0.4in - M8: Width 19mm / 0.7in, Height 12mm / 0.5in - M10: Width 22mm / 0.9in, Height 13mm / 0.5in - M12: Width 24mm / 0.9in, Height 16mm / 0.6in - M14: Width 27mm / 1.1in, Height 16mm / 0.6in - M16: Width 30mm / 1.2in, Height 18mm / 0.7in - M18: Width 32mm / 1.3in, Height 20mm / 0.8in - M20: Width 36mm / 1.4in, Height 22mm / 0.9in Package List: 50 x Lock Nuts